Sands showed the equivalence of the third-order aspheric surface contribution of the aberration polynomial to the third-order inhomogenous surface contribution. This fact is exemplified by the substitution of an axial gradient for the aspheric surface of the Schmidt corrector plate. It is shown that a gradient-index corrector plate system is limited in its off-axis performance by conventional Schmidt system is.
© 1977 Optical Society of America
Duncan T. Moore, "Catadioptric system with a gradient-index corrector plate," J. Opt. Soc. Am. 67, 1143-1146 (1977)